In a family, there are three siblings: X, Y, and Z. X is older than Y, and Y is older than Z. If Z is 10 years old, how old is X at least?

B. 11

In a family, there are two parents and three children. The father is a chef, and the mother is a nurse. If one child wants to be a chef, another wants to be a nurse, what is the profession of the third child?

C. NOT SPECIFIED

In a family, A is the brother of B, and C is the sister of B. If A is 15 years old and B is 2 years older than A, how old is C?

D. NOT SPECIFIED

In a group of five friends: Alice, Bob, Charlie, David, and Eva, the following conditions apply: Alice is not friends with Bob. Charlie is friends with both Alice and Eva. David is friends with Bob but not with Eva. Who can be selected if we want to choose friends of Alice only?

B. CHARLIE

In a class of students, the following rules apply for selection: Only students who scored above 75% and participated in the science fair can be selected. If the students are: John (80%, participated), Sarah (70%, participated), Mike (85%, not participated), and Lisa (90%, participated), who qualifies for selection?

C. JOHN AND LISA